1// SPDX-License-Identifier: GPL-2.0
2/*
3 * UIO Hilscher CIF card driver
4 *
5 * (C) 2007 Hans J. Koch <hjk@hansjkoch.de>
6 * Original code (C) 2005 Benedikt Spranger <b.spranger@linutronix.de>
7 */
8
9#include <linux/device.h>
10#include <linux/module.h>
11#include <linux/pci.h>
12#include <linux/slab.h>
13#include <linux/uio_driver.h>
14
15#include <asm/io.h>
16
17#define PLX9030_INTCSR		0x4C
18#define INTSCR_INT1_ENABLE	0x01
19#define INTSCR_INT1_STATUS	0x04
20#define INT1_ENABLED_AND_ACTIVE	(INTSCR_INT1_ENABLE | INTSCR_INT1_STATUS)
21
22#define PCI_SUBVENDOR_ID_PEP	0x1518
23#define CIF_SUBDEVICE_PROFIBUS	0x430
24#define CIF_SUBDEVICE_DEVICENET	0x432
25
26
27static irqreturn_t hilscher_handler(int irq, struct uio_info *dev_info)
28{
29	void __iomem *plx_intscr = dev_info->mem[0].internal_addr
30					+ PLX9030_INTCSR;
31
32	if ((ioread8(plx_intscr) & INT1_ENABLED_AND_ACTIVE)
33	    != INT1_ENABLED_AND_ACTIVE)
34		return IRQ_NONE;
35
36	/* Disable interrupt */
37	iowrite8(ioread8(plx_intscr) & ~INTSCR_INT1_ENABLE, plx_intscr);
38	return IRQ_HANDLED;
39}
40
41static int hilscher_pci_probe(struct pci_dev *dev,
42					const struct pci_device_id *id)
43{
44	struct uio_info *info;
45
46	info = devm_kzalloc(&dev->dev, sizeof(struct uio_info), GFP_KERNEL);
47	if (!info)
48		return -ENOMEM;
49
50	if (pci_enable_device(dev))
51		return -ENODEV;
52
53	if (pci_request_regions(dev, "hilscher"))
54		goto out_disable;
55
56	info->mem[0].addr = pci_resource_start(dev, 0);
57	if (!info->mem[0].addr)
58		goto out_release;
59	info->mem[0].internal_addr = pci_ioremap_bar(dev, 0);
60	if (!info->mem[0].internal_addr)
61		goto out_release;
62
63	info->mem[0].size = pci_resource_len(dev, 0);
64	info->mem[0].memtype = UIO_MEM_PHYS;
65	info->mem[1].addr = pci_resource_start(dev, 2);
66	info->mem[1].size = pci_resource_len(dev, 2);
67	info->mem[1].memtype = UIO_MEM_PHYS;
68	switch (id->subdevice) {
69		case CIF_SUBDEVICE_PROFIBUS:
70			info->name = "CIF_Profibus";
71			break;
72		case CIF_SUBDEVICE_DEVICENET:
73			info->name = "CIF_Devicenet";
74			break;
75		default:
76			info->name = "CIF_???";
77	}
78	info->version = "0.0.1";
79	info->irq = dev->irq;
80	info->irq_flags = IRQF_SHARED;
81	info->handler = hilscher_handler;
82
83	if (uio_register_device(&dev->dev, info))
84		goto out_unmap;
85
86	pci_set_drvdata(dev, info);
87
88	return 0;
89out_unmap:
90	iounmap(info->mem[0].internal_addr);
91out_release:
92	pci_release_regions(dev);
93out_disable:
94	pci_disable_device(dev);
95	return -ENODEV;
96}
97
98static void hilscher_pci_remove(struct pci_dev *dev)
99{
100	struct uio_info *info = pci_get_drvdata(dev);
101
102	uio_unregister_device(info);
103	pci_release_regions(dev);
104	pci_disable_device(dev);
105	iounmap(info->mem[0].internal_addr);
106}
107
108static struct pci_device_id hilscher_pci_ids[] = {
109	{
110		.vendor =	PCI_VENDOR_ID_PLX,
111		.device =	PCI_DEVICE_ID_PLX_9030,
112		.subvendor =	PCI_SUBVENDOR_ID_PEP,
113		.subdevice =	CIF_SUBDEVICE_PROFIBUS,
114	},
115	{
116		.vendor =	PCI_VENDOR_ID_PLX,
117		.device =	PCI_DEVICE_ID_PLX_9030,
118		.subvendor =	PCI_SUBVENDOR_ID_PEP,
119		.subdevice =	CIF_SUBDEVICE_DEVICENET,
120	},
121	{ 0, }
122};
123
124static struct pci_driver hilscher_pci_driver = {
125	.name = "hilscher",
126	.id_table = hilscher_pci_ids,
127	.probe = hilscher_pci_probe,
128	.remove = hilscher_pci_remove,
129};
130
131module_pci_driver(hilscher_pci_driver);
132MODULE_DEVICE_TABLE(pci, hilscher_pci_ids);
133MODULE_LICENSE("GPL v2");
134MODULE_AUTHOR("Hans J. Koch, Benedikt Spranger");
135